body {
  background-color: #00A86B;
}

h1 {
  color: lightgreen;
  background-color: gray;
  text-align: center;
}

button {
  color: purple;
  font-size: 21px;
  display: block;
  margin: auto;;
}

h2 {
  font-size: 25px;
  color: white;
}

h3 {
  color: white;
}